Iodine
Chlorine, the halogen in period 3.
chlorine
1s2s2p3s3p4s4p5s5p6s6p
Yes, I (iodine) is a halogen.
Iodine
Astatine is the 6th period halogen.
Iodine, element number 53 is the halogen (Group 17) element in period 5.
chlorine
bromine
Fluorine
It is bromine. Edit: NO. It is NOT bromine. The third period halogen is chlorine (Cl). Bromine happens to be in period 4.
This chemical element is astatine (At).
Bromine. :)
Chlorine, the halogen in period 3.
Nitrogen is not a halogen; nitrogen is a pnictide, group 15 and period 2 in the periodic table of Mendeleev.
chlorine